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Date: Thu, 31 May 2018 17:42:17 -0700
From: Kees Cook <keescook@...omium.org>
To: Matthew Wilcox <mawilcox@...rosoft.com>
Cc: Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Matthew Wilcox <willy@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: [PATCH v3 00/16] Provide saturating helpers for allocation

This is a stab at providing three new helpers for allocation size
calculation:

struct_size(), array_size(), and array3_size().

These are implemented on top of Rasmus's overflow checking functions. The
existing allocators are adjusted to use the more efficient overflow
checks as well.

While the tree-wide conversions continue to be largely unchanged,
I've updated their commit logs a bit with some more details on
rationale and options. Notably, while there are NO plans to replace
kmalloc_array() and kcalloc() with kmalloc(array_size(...),...) and
kzalloc(array_size(...),...), the treewide conversions only add the
new helpers, as making the ..._array() and ...calloc() conversions
balloons the Coccinelle script terribly (I haven't found a way to
make the replacement function name depend on the matched regular expression).
So, while nothing does:
    kmalloc_array(a, b, ...) -> kmalloc(array_size(a, b), ...)
the treewide changes DO perform changes like this:
    kmalloc(a * b, ...) -> kmalloc(array_size(a, b), ...)

It should also be noted that the treewide changes overlap with a few
recently reported "real" overflows, so these aren't theoretical fixes.

At the very least, I'd like to get the helpers and self-test landed in
the v4.18 merge window (coming right up!) since those are relatively
self-contained. If the treewide changes need adjustment we've got,
in theory, through the end of -rc2 to land those.

The series is also up here:
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=kspp/overflow/array_size

Thanks!

-Kees

Changes from v2:
- updated commit logs
- added full allocator test coverage to test_overflow.ko

Changes from v1:
- use explicit overflow helpers instead of array_size() helpers.
- drop early-checks for SIZE_MAX.
- protect devm_kmalloc()-family from addition overflow.
- added missing overflow.h includes.
- fixed 0-day issues in a few treewide manual conversions


Kees Cook (14):
  lib: overflow: Report test failures
  overflow.h: Add allocation size calculation helpers
  lib: overflow: Add memory allocation overflow tests
  mm: Use overflow helpers in kmalloc_array*()
  mm: Use overflow helpers in kvmalloc()
  device: Use overflow helpers for devm_kmalloc()
  treewide: Use struct_size() for kmalloc()-family
  treewide: Use struct_size() for vmalloc()-family
  treewide: Use struct_size() for devm_kmalloc() and friends
  treewide: Use array_size() for kmalloc()-family
  treewide: Use array_size() for kmalloc()-family, leftovers
  treewide: Use array_size() for vmalloc()
  treewide: Use array_size() for devm_*alloc()-like
  treewide: Use array_size() for devm_*alloc()-like, leftovers

Rasmus Villemoes (2):
  compiler.h: enable builtin overflow checkers and add fallback code
  lib: add runtime test of check_*_overflow functions

 arch/arm/kernel/sys_oabi-compat.c             |   4 +-
 arch/arm/mach-footbridge/dc21285.c            |   2 +-
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 arch/arm/mach-omap2/prm_common.c              |  10 +-
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 arch/arm/mm/pgd.c                             |   2 +-
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 fs/gfs2/rgrp.c                                |   2 +-
 fs/gfs2/super.c                               |   3 +-
 fs/hpfs/dnode.c                               |   2 +-
 fs/hpfs/map.c                                 |   2 +-
 fs/jbd2/revoke.c                              |   3 +-
 fs/jffs2/wbuf.c                               |   3 +-
 fs/jfs/jfs_dmap.c                             |   3 +-
 fs/jfs/jfs_dtree.c                            |  14 +-
 fs/jfs/jfs_unicode.c                          |   2 +-
 fs/mbcache.c                                  |   2 +-
 fs/namei.c                                    |   8 +-
 fs/nfs/flexfilelayout/flexfilelayout.c        |   2 +-
 fs/nfs/flexfilelayout/flexfilelayoutdev.c     |   2 +-
 fs/nfsd/export.c                              |   4 +-
 fs/nfsd/nfs4recover.c                         |   4 +-
 fs/nfsd/nfs4state.c                           |  16 +-
 fs/nfsd/nfscache.c                            |   2 +-
 fs/ntfs/compress.c                            |   2 +-
 fs/ocfs2/cluster/tcp.c                        |   2 +-
 fs/ocfs2/dlm/dlmdomain.c                      |   2 +-
 fs/ocfs2/journal.c                            |   2 +-
 fs/ocfs2/sysfile.c                            |   4 +-
 fs/overlayfs/namei.c                          |   2 +-
 fs/proc/base.c                                |   3 +-
 fs/proc/proc_sysctl.c                         |   2 +-
 fs/proc/task_mmu.c                            |   2 +-
 fs/read_write.c                               |   6 +-
 fs/reiserfs/bitmap.c                          |   2 +-
 fs/reiserfs/inode.c                           |   3 +-
 fs/reiserfs/journal.c                         |  10 +-
 fs/reiserfs/resize.c                          |   2 +-
 fs/select.c                                   |   2 +-
 fs/splice.c                                   |   9 +-
 fs/ubifs/journal.c                            |   2 +-
 fs/ubifs/lpt.c                                |  12 +-
 fs/ubifs/super.c                              |   3 +-
 fs/ubifs/tnc.c                                |   2 +-
 fs/ubifs/tnc_commit.c                         |   5 +-
 fs/udf/super.c                                |   7 +-
 fs/ufs/super.c                                |   2 +-
 include/linux/compiler-clang.h                |  14 +
 include/linux/compiler-gcc.h                  |   4 +
 include/linux/compiler-intel.h                |   4 +
 include/linux/device.h                        |   8 +-
 include/linux/mm.h                            |   7 +-
 include/linux/overflow.h                      | 278 ++++++++++++
 include/linux/slab.h                          |  17 +-
 include/linux/vmalloc.h                       |   1 +
 ipc/sem.c                                     |   2 +-
 kernel/bpf/lpm_trie.c                         |   2 +-
 kernel/bpf/verifier.c                         |   5 +-
 kernel/cgroup/cgroup-v1.c                     |   4 +-
 kernel/cgroup/cgroup.c                        |   4 +-
 kernel/cgroup/cpuset.c                        |   5 +-
 kernel/debug/kdb/kdb_main.c                   |   9 +-
 kernel/events/uprobes.c                       |   3 +-
 kernel/fail_function.c                        |   2 +-
 kernel/locking/locktorture.c                  |  10 +-
 kernel/module.c                               |   3 +-
 kernel/power/swap.c                           |   6 +-
 kernel/rcu/rcutorture.c                       |   3 +-
 kernel/relay.c                                |   3 +-
 kernel/sched/fair.c                           |   5 +-
 kernel/sched/rt.c                             |   4 +-
 kernel/sched/topology.c                       |   2 +-
 kernel/sysctl.c                               |   2 +-
 kernel/trace/ftrace.c                         |  21 +-
 kernel/trace/trace.c                          |  10 +-
 kernel/trace/trace_events_filter.c            |   8 +-
 kernel/user_namespace.c                       |   4 +-
 kernel/workqueue.c                            |   5 +-
 lib/Kconfig.debug                             |   3 +
 lib/Makefile                                  |   1 +
 lib/argv_split.c                              |   2 +-
 lib/bucket_locks.c                            |   3 +-
 lib/interval_tree_test.c                      |   5 +-
 lib/kfifo.c                                   |   2 +-
 lib/lru_cache.c                               |   3 +-
 lib/mpi/mpiutil.c                             |   6 +-
 lib/rbtree_test.c                             |   2 +-
 lib/reed_solomon/reed_solomon.c               |   9 +-
 lib/scatterlist.c                             |   3 +-
 lib/test_overflow.c                           | 427 ++++++++++++++++++
 lib/test_rhashtable.c                         |   4 +-
 lib/test_string.c                             |   6 +-
 lib/test_user_copy.c                          |   2 +-
 mm/gup_benchmark.c                            |   2 +-
 mm/huge_memory.c                              |   2 +-
 mm/hugetlb.c                                  |   3 +-
 mm/slab.c                                     |   3 +-
 mm/slub.c                                     |  17 +-
 mm/swap_slots.c                               |   4 +-
 mm/swap_state.c                               |   3 +-
 mm/swapfile.c                                 |   4 +-
 net/9p/protocol.c                             |   5 +-
 net/9p/trans_virtio.c                         |   3 +-
 net/atm/mpc.c                                 |   3 +-
 net/bluetooth/hci_core.c                      |   3 +-
 net/bluetooth/l2cap_core.c                    |   3 +-
 net/bridge/br_multicast.c                     |   2 +-
 net/bridge/netfilter/ebtables.c               |  10 +-
 net/can/bcm.c                                 |   6 +-
 net/ceph/mon_client.c                         |   5 +-
 net/ceph/osd_client.c                         |   3 +-
 net/ceph/osdmap.c                             |   2 +-
 net/ceph/pagevec.c                            |   4 +-
 net/core/dev.c                                |   3 +-
 net/core/ethtool.c                            |  10 +-
 net/dcb/dcbnl.c                               |   3 +-
 net/dccp/ccids/ccid2.c                        |   3 +-
 net/ieee802154/nl-phy.c                       |   2 +-
 net/ipv4/fib_frontend.c                       |   2 +-
 net/ipv4/route.c                              |   6 +-
 net/ipv6/icmp.c                               |   3 +-
 net/ipv6/ila/ila_xlat.c                       |   3 +-
 net/ipv6/route.c                              |   2 +-
 net/mac80211/chan.c                           |   3 +-
 net/mac80211/main.c                           |   3 +-
 net/mac80211/rc80211_minstrel.c               |   5 +-
 net/mac80211/rc80211_minstrel_ht.c            |   6 +-
 net/mac80211/scan.c                           |   2 +-
 net/mac80211/util.c                           |   4 +-
 net/netfilter/ipvs/ip_vs_conn.c               |   2 +-
 net/netfilter/nf_conntrack_proto.c            |   3 +-
 net/netfilter/nf_nat_core.c                   |   2 +-
 net/netfilter/nf_tables_api.c                 |   4 +-
 net/netfilter/nfnetlink_cthelper.c            |   4 +-
 net/netfilter/x_tables.c                      |   3 +-
 net/netfilter/xt_dccp.c                       |   2 +-
 net/netfilter/xt_recent.c                     |   3 +-
 net/netlink/genetlink.c                       |   8 +-
 net/netrom/af_netrom.c                        |   3 +-
 net/openvswitch/datapath.c                    |   2 +-
 net/openvswitch/vport.c                       |   2 +-
 net/rds/ib.c                                  |   2 +-
 net/rds/info.c                                |   3 +-
 net/rose/af_rose.c                            |   3 +-
 net/rxrpc/rxkad.c                             |   2 +-
 net/sched/sch_fq_codel.c                      |   7 +-
 net/sched/sch_hhf.c                           |   8 +-
 net/sctp/auth.c                               |   4 +-
 net/sctp/endpointola.c                        |   4 +-
 net/sctp/protocol.c                           |   3 +-
 net/smc/smc_wr.c                              |   5 +-
 net/sunrpc/auth_gss/auth_gss.c                |   4 +-
 net/sunrpc/auth_gss/gss_krb5_crypto.c         |   2 +-
 net/sunrpc/auth_gss/gss_rpc_upcall.c          |   3 +-
 net/sunrpc/cache.c                            |   2 +-
 net/tipc/netlink_compat.c                     |   4 +-
 net/wireless/nl80211.c                        |   4 +-
 security/apparmor/policy_unpack.c             |   2 +-
 security/keys/trusted.c                       |   2 +-
 security/selinux/ss/services.c                |   2 +-
 sound/core/pcm_compat.c                       |   2 +-
 sound/core/pcm_native.c                       |   4 +-
 sound/core/seq/seq_midi_emul.c                |   3 +-
 sound/core/vmaster.c                          |   4 +-
 sound/firewire/dice/dice-transaction.c        |   4 +-
 sound/firewire/fireface/ff-protocol-ff400.c   |   2 +-
 sound/firewire/packets-buffer.c               |   3 +-
 sound/oss/dmasound/dmasound_core.c            |   2 +-
 sound/pci/cs46xx/cs46xx_lib.c                 |   6 +-
 sound/pci/cs46xx/dsp_spos.c                   |   6 +-
 sound/pci/ctxfi/ctatc.c                       |  25 +-
 sound/pci/ctxfi/ctdaio.c                      |   3 +-
 sound/pci/ctxfi/ctmixer.c                     |   5 +-
 sound/pci/ctxfi/ctsrc.c                       |   2 +-
 sound/pci/emu10k1/emufx.c                     |   6 +-
 sound/pci/hda/hda_codec.c                     |   6 +-
 sound/pci/hda/hda_proc.c                      |   2 +-
 sound/pci/hda/patch_ca0132.c                  |   3 +-
 sound/pci/trident/trident_main.c              |   2 +-
 sound/pci/via82xx.c                           |   3 +-
 sound/pci/via82xx_modem.c                     |   3 +-
 sound/pci/ymfpci/ymfpci_main.c                |   2 +-
 sound/soc/au1x/dbdma2.c                       |   2 +-
 sound/soc/codecs/hdmi-codec.c                 |   3 +-
 sound/soc/codecs/rt5645.c                     |   3 +-
 sound/soc/codecs/wm8904.c                     |   4 +-
 sound/soc/codecs/wm8958-dsp2.c                |  16 +-
 sound/soc/codecs/wm8994.c                     |   3 +-
 sound/soc/codecs/wm_adsp.c                    |   2 +-
 sound/soc/davinci/davinci-mcasp.c             |  12 +-
 sound/soc/generic/audio-graph-card.c          |   6 +-
 sound/soc/generic/audio-graph-scu-card.c      |   6 +-
 sound/soc/generic/simple-card.c               |   9 +-
 sound/soc/generic/simple-scu-card.c           |   6 +-
 sound/soc/img/img-i2s-in.c                    |   3 +-
 sound/soc/img/img-i2s-out.c                   |   3 +-
 sound/soc/intel/common/sst-ipc.c              |   4 +-
 sound/soc/intel/skylake/skl-topology.c        |  10 +-
 sound/soc/pxa/mmp-sspa.c                      |   4 +-
 sound/soc/qcom/apq8016_sbc.c                  |   3 +-
 sound/soc/rockchip/rk3399_gru_sound.c         |   2 +-
 sound/soc/sh/rcar/cmd.c                       |   2 +-
 sound/soc/sh/rcar/core.c                      |   4 +-
 sound/soc/sh/rcar/ctu.c                       |   2 +-
 sound/soc/sh/rcar/dvc.c                       |   3 +-
 sound/soc/sh/rcar/mix.c                       |   3 +-
 sound/soc/sh/rcar/src.c                       |   3 +-
 sound/soc/sh/rcar/ssi.c                       |   3 +-
 sound/soc/sh/rcar/ssiu.c                      |   3 +-
 sound/soc/soc-core.c                          |  10 +-
 sound/soc/soc-dapm.c                          |   7 +-
 sound/soc/soc-topology.c                      |   2 +-
 sound/soc/uniphier/aio-cpu.c                  |   7 +-
 sound/usb/6fire/pcm.c                         |   8 +-
 sound/usb/caiaq/audio.c                       |   9 +-
 sound/usb/format.c                            |   6 +-
 sound/usb/line6/capture.c                     |   4 +-
 sound/usb/line6/pcm.c                         |   4 +-
 sound/usb/line6/playback.c                    |   4 +-
 sound/usb/mixer.c                             |   3 +-
 sound/usb/pcm.c                               |   2 +-
 sound/usb/usx2y/usbusx2y.c                    |   2 +-
 sound/usb/usx2y/usbusx2yaudio.c               |   6 +-
 tools/virtio/ringtest/ptr_ring.c              |   2 +-
 virt/kvm/arm/vgic/vgic-v4.c                   |   2 +-
 1263 files changed, 4034 insertions(+), 2767 deletions(-)
 create mode 100644 include/linux/overflow.h
 create mode 100644 lib/test_overflow.c

-- 
2.17.0

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